Nitrogen addition reduced carbon mineralization of aggregates in forest soils but enhanced in paddy soils in South China

Ecological Processes

Table 2 C, total N (TN), and total P (TP) contents in the different sizes of aggregates in forest and paddy soils

Soil	Particle size (μm)	Proportion (%)	SOC (mg g⁻¹)	TN (mg g⁻¹)	C/N	TP (mg g⁻¹)	N/P
Forest soil	Bulk soil	–	30.3 ± 1.2c	2.15 ± 0.13b	14.1 ± 0.9b	0.45 ± 0.03a	4.83 ± 0.51b
	250–2000	12.0 ± 1.9a	43.3 ± 1.6e	2.07 ± 0.05b	21.0 ± 1.3d	0.43 ± 0.04a	4.87 ± 0.48b
	53–250	27.6 ± 0.8b	28.3 ± 1.8c	2.14 ± 0.07b	13.2 ± 0.7b	0.46 ± 0.07a	4.72 ± 0.94b
	< 53	56.8 ± 2.1c	19.3 ± 1.7a	2.26 ± 0.07b	8.5 ± 0.5a	0.49 ± 0.03a	4.64 ± 0.35b
Paddy soil	Bulk soil	–	24.1 ± 1.1b	1.82 ± 0.21a	13.4 ± 2.0b	1.09 ± 0.07b	1.68 ± 0.27a
	250–2000	8.1 ± 0.4a	34.9 ± 2.4d	2.07 ± 0.13b	16.9 ± 0.4c	1.27 ± 0.13c	1.65 ± 0.27a
	53–250	25.2 ± 5.8b	31.0 ± 1.2c	1.82 ± 0.16a	17.1 ± 0.9c	0.99 ± 0.09b	1.85 ± 0.25a
	< 53	65.2 ± 4.7d	21.6 ± 1.2ab	1.65 ± 0.09a	13.1 ± 0.2b	1.04 ± 0.15b	1.60 ± 0.17a

Different letters denote the significant differences among different particle sizes of aggregates by one-way ANOVA (p < 0.05)